I don't want to install sqlite globally in my system, so I have downloaded the sqlite3 files from https://www.sqlite.org/2018/sqlite-amalgamation-3240000.zip and have copied sqlite3.c and sqlite3.h into the project folder.
CMakeLists.txt:
cmake_minimum_required(VERSION 3.10)
project(learn_cpp)
set(CMAKE_CXX_STANDARD 11)
add_executable(learn_cpp main.cpp)
main.cpp :
#include <iostream>
#include "sqlite3.h"
int main() {
return 0;
}
I am not getting any of the functions from sqlite3.h as suggestion in the CLion IDE.
By default, CMake doesn't search headers files in the current directory. For enable this behaviour, set CMAKE_INCLUDE_CURRENT_DIR variable:
set(CMAKE_INCLUDE_CURRENT_DIR ON)
add_executable(learn_cpp main.cpp ...)
Related
I want to crosscompile a shared library (c and cpp code) on my Ubuntu System (x86_64) for Android aarch64. For reasons of simplicity for this example I created only a source and a header file.
The header file header.hpp within /include
int test();
The source file src.cpp within /src
#include "../include/header.hpp" // #include "../include/header.h"
int test() {
return 42;
}
My CMakeLists.txt
cmake_minimum_required(VERSION 3.6.0)
set(CMAKE_TOOLCHAIN_FILE android.toolchain.cmake)
project(testlibrary)
# find header & source
file(GLOB_RECURSE SOURCE_CPP "src/*.cpp")#file(GLOB_RECURSE SOURCE_C "src/*.c")
file(GLOB_RECURSE HEADER "include/*.h")
add_library(${PROJECT_NAME} SHARED
${SOURCE_CPP}
${HEADER}
)
My android.toolchain.cmake
cmake_minimum_required(VERSION 3.6.0)
set(CMAKE_CXX_COMPILER "/usr/bin/aarch64-linux-gnu-g++")#set(CMAKE_C_COMPILER "/usr/bin/aarch64-linux-gnu-gcc")
set(CMAKE_ANDROID_NDK /home/ubuntu/Android/Sdk/ndk/21.4.7075529)
After calling my function within my app I receive the following error message:
Could not invoke FunctionCaller.test_function
null
Error looking up function 'testFunc': undefined symbol: testFunc
Not finding testFunc seems to be related to not compiling or correctly linking my .cpp/.hpp files I suppose.
Changing my setup from cpp to c and everything is found and I receive the correct return value.
C++
C
src.cpp
src.c
header.hpp
header.c
#include "../include/header.hpp"
#include "../include/header.h"
file(GLOB_RECURSE SOURCE_CPP "src/*.cpp")
file(GLOB_RECURSE SOURCE_C "src/*.c")
set(CMAKE_CXX_COMPILER "/usr/bin/aarch64-linux-gnu-g++")
set(CMAKE_C_COMPILER "/usr/bin/aarch64-linux-gnu-gcc")
What am I missing here? I expected it to fail for both configurations since I installed both compilers the same way.
I have a CMake project with these relevant folders:
project_folder
-src
|--main.c
peripherals
|--something.h
|--something.c
My CMake in project_folder includes:
add_subdirectory(peripherals)
if (NOT $ENV{TARGET_SOURCES} STREQUAL "")
target_sources(app PRIVATE $ENV{TARGET_SOURCES})
else()
target_sources(app PRIVATE src/main.c)
endif()
My CMake under peripherals incudes:
add_library (peripherals something.c)
target_include_directories (peripherals PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
CMake under src:
add_executable(app main.c)
target_link_libraries(app PRIVATE peripherals)
My project is building fully but when I try to include my header file in main.c I get:
project_folder/peripherals/something.h:No such file or directory
In my main.c file I have #include "peripherals/something.h". Does anyone know how to fix this? I'm not sure if my #include statement is correct and I think I am missing stuff in my CMakeLists files
You can either do "#include "../peripherals/i2c_test.h" in your main.cpp
OR
in your CMake in project_folder:
target_include_directories(app ${CMAKE_CURRENT_SOURCE_DIR})
and then in main.c:
#include <peripherals/i2c_test.h>
....
You'll need to define executable and "link" it with the library:
# project_folder/CMakeLists.txt
add_subdirectory(peripherals)
add_subdirectory(src)
# project_folder/src/CMakeLists.txt
add_executable(my_executable main.c)
target_link_libraries(my_executable PRIVATE peripherals)
Then, you'll need to include the header in main.c properly- since you've linked against a library that includes peripherals directory, you can now directly include it:
#include "something.h"
Your include statement has to be relative to the included directory.
Edit: In your example ${CMAKE_CURRENT_SOURCE_DIR} is the project directory (where your CMake file is).
Therefore you should be able to write:
#include <peripherals/something.h>
You can always check a cmake variable's content by printing it. In your CMake file you can write:
message(STATUS ${CMAKE_CURRENT_SOURCE_DIR})
When running cmake you should see the path printed in the console output.
in your CMake in project_folder:
include_directories(src)
and then in main.c:
#include <peripherals/i2c_test.h>
OR
in your CMake in project_folder:
include_directories(src/peripherals)
and then in main.c:
#include <i2c_test.h>
I've created a shared library with library.h and library.cpp. Then wrote a CMakeLists.txt file to build it as a shared library.
CMakeLists.txt
cmake_minimum_required(VERSION 3.10)
project(test_pro)
set(CMAKE_CXX_STANDARD 11)
add_library(test_pro SHARED library.cpp library.h)
after building the library, I was able to get a .so file as /home/user/projects/test_lib/bin/libtest_pro.so
Then I tried linking the created library to another project in /home/user/projects/testproject
CMakeLists.txt
cmake_minimum_required(VERSION 3.10)
project(testproject)
set(CMAKE_CXX_STANDARD 11)
link_directories(
/home/user/projects/test_lib/bin
)
add_executable(testproject main.cpp)
target_link_libraries (testproject test_pro)
It successfully builds the testproject (ldd command shows it has linked correctly), but I'm unable to use the library I've created in it.
In the main.cpp I've tried,
#include "library.h"
#include "test_pro"
#include <test_pro>
#include <test_pro/library.h>
But all the above gave build failures (fatal error: xxx: No such file or directory). How do I use this created library?
Just like you set link_directories() you have to specify include_directories(). And it is recommended not to use link_directories() at all, instead pass absolute path to the library into target_link_libraries().
I have a project in Clion using CMake and C++14. The project compiles but all standard library includes are marked as:
"Cannot find string", "Cannot find stdexcept", etc.
Additionally the symbols from the dll I included are not being detected. So they are all marked as:
"Cannot resolve ..."
I've included the header and cmakelist.txt. This is only happening in this project and I have almost identical cmakelist.txt files for all my projects. I have tried restarting CLion's cache. I also tried moving all the files to a new project which worked momentarily but with an hour CLion was flagging these lines again.
cmakelists.txt
cmake_minimum_required(VERSION 3.6)
project(BCI)
set(CMAKE_CXX_STANDARD 14)
#create dlls and executables in the root directory
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR})
include_directories(
${CMAKE_SOURCE_DIR}
)
set(SOURCE_FILES
NeuralInterface.hpp
)
add_library(BCI SHARED ${SOURCE_FILES})
set_target_properties(BCI PROPERTIES LINKER_LANGUAGE CXX)
NeuralInterface.hpp
#ifndef NEURALINTERFACE_HPP
#define NEURALINTERFACE_HPP
//c++ includes
#include <stdexcept> //these are the includes which cannnot be resolved
#include <string>
//project includes
#include "okFrontPanelDLL.h"
extern std::string IntanAcquire; //this says cannot resolve container std
...
#endif
What else can I do to CMake so it finds these headers?
Wt v. 3.2.2 and boost libraries v. 1.47 had succesfully installed in my computer and no errors occured in the installation process. Some simple Wt and Boost examples were compiled and ran correctly in the testing process. I use CMake, configured for MSVC 2008, to create the build files for my own Wt projects.
However, when I try to build my own project, I get this error (Cannot open include file: 'boost/any.hpp'). As I saw, boost/any.hpp is included in Wt/WApplication header file.
For further help, my CMakeLists.txt files contents are:
CMakeLists.txt placed on project directory:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(WT_EXAMPLE)
SET (WT_CONNECTOR "wthttp" CACHE STRING "Connector used (wthttp or wtfcgi)")
ADD_SUBDIRECTORY(source)
CMakeLists.txt placed on source directory:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
SET(WT_INSTALL_DIR "C:/Program Files/WT/boost_1_47")
SET(BOOST_INSTALL_DIR "C:/Program Files/boost")
ADD_EXECUTABLE(
GOP.wt
Main.C
)
SET(WT_LIBS
optimized wthttp debug wthttpd
optimized wt debug wtd)
SET(BOOST_LIBS
boost_signals boost_regex boost_thread boost_filesystem boost_system
boost_random boost_date_time boost_program_options)
TARGET_LINK_LIBRARIES (
GOP.wt
${WT_LIBS} ${BOOST_LIBS} ${SYSTEM_LIBS}
)
LINK_DIRECTORIES (
${WT_INSTALL_DIR}/lib/
${BOOST_INSTALL_DIR}/lib/
)
INCLUDE_DIRECTORIES(${WT_INSTALL_DIR}/include)
INCLUDE_DIRECTORIES(${BOOST_INSTALL_DIR}/include)
As I saw in the CMakeCache.txt placed on Wt build directory, paths to boost libraries were found, but ...what about this line?
//The directory containing a CMake configuration file for Boost.
Boost_DIR:PATH=Boost_DIR-NOTFOUND
I asked this question on Wt support forum but I didn't get an answer for about 24 hours...
Update: I found that any.hpp is placed on C:\Program Files\boost\boost_1_47\boost\spirit\home\support\algorithm\any.hpp. So, i suspect that there's a concept with the path that searches any.hpp (it's not directly included in boost directory).
Problem solved. I did a new Wt build, I placed and rebuild boost in a new path and I wrote CMakeLists for this project with more caution.
To include <boost/any.hpp>
For example
#include <boost/any.hpp>
#include <iostream>
#include <vector>
#include <string>
int main() {
std::vector<boost::any> some_values;
some_values.push_back(10);
const char* c_str = "Hello there!";
some_values.push_back(c_str);
some_values.push_back(std::string("Wow!"));
std::string& s = boost::any_cast<std::string&>(some_values.back());
s += " That is great!\n";
std::cout << s;
}
we only need a simple cmake file like
# Defines AppBase library target.
project(recipe_01)
cmake_minimum_required(VERSION 3.5)
include(GNUInstallDirs)
set(CMAKE_EXPORT_COMPILE_COMMANDS "ON")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
if(CMAKE_CXX_STANDARD EQUAL 98 OR CMAKE_CXX_STANDARD LESS 14)
message(FATAL_ERROR "app requires c++14 or newer")
elseif(NOT CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
find_package(Boost 1.60 REQUIRED)
add_executable(main main.cpp)
target_link_libraries(main)